William o



o. 752,275. PATENTE-D FEB. 16, 1904.

W. 0. WEBBER.

FAN BLADEL APPLIOATION FILED FEB. 27, 1902 N0 MODEL.

\ WITNESSES ATTORNEY.

IN VENTOI? 20 s o c 'voverthose heretofore employed 15 that it is UNlTED v STAT S WILLIAM o. WEBBER, or BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BELL Pennant & COOLING (30.,01 NEW YORK, N. Y;

Patented February 16, 1904.

" FA -BLADE".

srncmca'rlon.

forming m of Letters" retail: 1%. #152,275, dated Februdry 1c, 1904.

Application filed elu'imljy 27, 1902. Serial No- 95,3 80. (lilo model.)

To all whom concern: Be it known that 1, WILLIAM OLIVER Wnn- "nnn a citizen of the United States, residing at I Boston, county of Suflolk, and State of sachusetts, have invented certain new and usefnl Improvements in Fan Blades, of which the following is a specification, reference being -made to the accompanying I drawings; 1n

- which- 1 -'Figure 1 is aplan viewof ablade 'involying:

' will result in my invention, and Fig, 2 is edge yiew' thereofiu This invention relates to'an improved form of fan-blade inconnectionzwith centrifugal is to. produce'an improved form of blade which handling the greatest-amount of air with the least amount of"power,- consethereto at successive points. f

quently resulting in a greater eificiency of op-; eration. V The difference in this form of blade made-up of a ser es ofcontiguous plane surfaces which are tangential to" any desiredbut definiteforrn of curve and are arranged seri- 'to the curve at but may adopt an a circle, or combination, of-" for ms otcurve to which the'success'ive plane surfaces may be tangent.

1 Referring to the accompanying drawings,

ed blade, which, as is composedof a sed, and 6, arranged C and tangent The blade thus constructed is attached to the spoke .B of the fan, it being understood, however, that blades of this form may be applied to or embodied in a fan structure in any bf the well-known successively along the curve ways and that any desirednumber of them ducing'a greater economical effect; I fan-blowers; and the object of this invention.

posed of a series cessively on the or any other form may be employed, The blade is also shown as of a lesser width at the tipjthan at the base; Careful experiments have demonstrated that a fan-blade ina fan-blower, consisting of a series of three orinore plane surfaces thus disposed to form consecutive tangents to any well-known and definite form, of curve, will handle a larger amount of air with a less con sumptionof power than "blades whose sur faces or working faces'are ofa strictly curved 4 form-that is, a bendingor inflection without angles therebyproducingafmarked increase in the eficiency of centrifugal, fans and pro- The fOI'm'Of blade whichjjl claim also pro duces a greater stiffness in the blades, the different plane'surfaces supporting and-stiffening each other,-

hus rendering them less liable tovibration, and consequently producing a more noiselessfan,

Whas I claim new, and by Letters Patent, is

, 1'. A curved fan-blade for centrifugalblow-"' said blade, having its working face comof fiat surfaces arranged sneers,

and said surfaces curve of the blade. e 2. 'A curved fan-blade for centrifugal bloware, said blade having a working face that is narrower toward the outerend of the blade forming tangents to the then towardits inner end, said working face comprising a series of flat surfaces arranged successively on the blade toward its outer end.

witness whereof I have hereunto set my hand,.bfore two subscribing witnesses, this 21st day. of February, 1901.

WILLIAM 0. Western,

Witnesses:

, (Inns; M. W. SMVITHQ, AMY F. Wnmmnson.

desire to secure blade toward its outer end, v 

